Find the missing angles

(01.02 lc) angle abc has point e on ray ba and point d on ray bc. points e and d are equidistant from point b. to bisect angle abc, which of the following needs to be identified for the construction? the distance between points e and d the point in the angle that is equidistant from points e and d the endpoint of rays ba and bc the point outside of the angle that is equidistant from points e and d

An arc subtends a central angle measuring 7pi/4 radians what fraction of the circumference is this arc?

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)